ILO LCD Color HDTV does not change channels / volumn...just turns on/off

I can't get the TV to respond to anything other than on/off. I have tried from the side buttons and from the remote. I can turn it on and off but no menu, +/-volumn,+/- channels, entering channels by numbers....none of the buttons on the remote do anything except the Power button. It comes on and reads ANALOG TV as usual then identifies the Channel A 47 with the word Mono underneath.... It plays the channel just fine but that's it..... just that one channel.... Then last thing I recall having done was gone into the TV Menu and set the channels... Could I have screwed something up there? Is there a way to reset the thing back to factory defualts? i have a zenith conciere and cant get to menu nor change channels